/*标签选择器*/
div{
    border: 1px brown solid;
}
/*类选择器*/
.s2{
    color: red;
    font-size: 2em;
}
/*id选择器*/
#ziBox{
    background-color: pink;
    width: 100px;
    height: 100px;
}
/*交集选择器*/
div.c2{
    font-size: 2em;
}
/*并集选择器*/
.c2,.s3{
    color: orange;
}
/*后代选择器*/
#bigBox span{
    font-size: 4em;
    color: black;
    font-family: 幼圆;
}
/*亲代选择器*/
.tag > span {
    color: green;
}
/*伪类选择器*/
a:hover{
    color: yellow;
    text-decoration: none;
}
a:active{
    color: red;
}
a:visited{
    color: black;
    text-decoration: underline;
}